Description: Click on the preview image to open a larger version that better illustrates this style.
This sepia style for SketchUp 6 has a background that features Leonardo's famous proportions study. There is also an overlay that softens everything. Note that the style is most effective if you paint your model in predominantly soft colours. I'd suggest doing as I did for my example image - paint some parts of the model the same colour as the background (rgb: 188.139.117). The style also features a custom sketchy line style that coordinates with the background.